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// Jump flooding algorithm for EDT according
// to Danielsson (1980) and Guodong Rong (2007).
// Implementation by Stefan Gustavson 2010.
// This code is in the public domain.
// This code represents one iteration of the flood filling.
// You need to run it multiple times with different step
// lengths to perform a full distance transformation.
uniform float texw;
uniform float texh;
uniform float step;
attribute vec2 position;
attribute vec2 texcoord;
varying float stepu;
varying float stepv;
varying vec2 uv;
void main( void )
{
// Get the texture coordinates
uv = texcoord.xy;
stepu = step / texw; // Saves a division in the fragment shader
stepv = step / texh;
gl_Position = vec4(position.xy, 0., 1.);
}
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